I guess the main confusion of defining this lens is probably the setting of depth/frequency. WK0:3q(P
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The main fresnel lens types are: U"=Lzo.0
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* Constant groove depth. C_Z/7x*>d
* Contant groove pitch types. N\|BaZ%>|
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So if your depth is fixed you will define +ve value in the cell and to specify the "height" or "depth" of each groove feature. If the frequency of the groove is fixed then you use -ve value. Say putting down - 5 this implies that there are 5 grooves with a unit length. zf>*\pZE
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Hope this helps!!
